91433eb577
typenamesym is called from three places: typename, ngotype, and Type.Symbol. Only in typename do we actually need a Node. ngotype and Type.Symbol require only a Sym. And writing the newly created Node to Sym.Def is unsafe in a concurrent backend. Rather than use a mutex protect to Sym.Def, make typenamesym not touch Sym.Def. The assignment to Sym.Def was serving a second purpose, namely to prevent duplicate entries on signatlist. Preserve that functionality by switching signatlist to a map. This in turn requires that we sort signatlist when exporting it, to preserve reproducibility. We'd like to use Type.cmp for sorting, but that causes infinite recursion at the moment; see #19869. For now, use Type.LongString as the sort key, which is a complete description of the type. Type.LongString is relatively expensive, but we calculate it only once per type, and signatlist is generally fairly small, so the performance impact is minimal. Updates #15756 name old alloc/op new alloc/op delta Template 39.4MB ± 0% 39.4MB ± 0% ~ (p=0.222 n=5+5) Unicode 29.8MB ± 0% 29.8MB ± 0% ~ (p=0.151 n=5+5) GoTypes 113MB ± 0% 113MB ± 0% ~ (p=0.095 n=5+5) SSA 1.25GB ± 0% 1.25GB ± 0% +0.04% (p=0.008 n=5+5) Flate 25.3MB ± 0% 25.4MB ± 0% ~ (p=0.056 n=5+5) GoParser 31.8MB ± 0% 31.8MB ± 0% ~ (p=0.310 n=5+5) Reflect 78.3MB ± 0% 78.3MB ± 0% ~ (p=0.690 n=5+5) Tar 26.7MB ± 0% 26.7MB ± 0% ~ (p=0.548 n=5+5) XML 42.2MB ± 0% 42.2MB ± 0% ~ (p=0.222 n=5+5) name old allocs/op new allocs/op delta Template 387k ± 0% 388k ± 0% ~ (p=0.056 n=5+5) Unicode 320k ± 0% 321k ± 0% +0.32% (p=0.032 n=5+5) GoTypes 1.14M ± 0% 1.15M ± 0% ~ (p=0.095 n=5+5) SSA 9.70M ± 0% 9.72M ± 0% +0.18% (p=0.008 n=5+5) Flate 234k ± 0% 235k ± 0% +0.60% (p=0.008 n=5+5) GoParser 317k ± 0% 317k ± 0% ~ (p=1.000 n=5+5) Reflect 982k ± 0% 983k ± 0% ~ (p=0.841 n=5+5) Tar 252k ± 1% 252k ± 0% ~ (p=0.310 n=5+5) XML 393k ± 0% 392k ± 0% ~ (p=0.548 n=5+5) Change-Id: I53a3b95d19cf1a7b7511a94fba896706addf84fb Reviewed-on: https://go-review.googlesource.com/39710 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> |
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The Go Programming Language
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